The easiest way to find a used computer store in the Minneapolis metro area is to look in the yellow pages. Another option is to visit a local pawn store, they often have used computers for sale.
You can purchase office furntire from a retailer like office depot. it is a great store, has plenty of suplies, and it is also a reputable store consumers can trust.
One can purchase ergonomic computer desks from several different places. Some of the places in which one can purchase ergonomic computer desks are: Heckler Design, and OSHA.
When buying computer desks, you can buy them online from almost any retailer. My best experience has been through well known retailers like Amazon.com or EBAY.com since they specialize in shipping at cost effective prices.
The web has a ton of links that can direct you to places to purchase a roll top computer desk for yourself. http://www.countrysidecabinetry.com/Desks/desk_gallery.htm
One option would be to explore your local area to see if there are any businesses going out of business where you could purchase their used computer desks at an affordable price. Otherwise, check out www.computerdesks.com
In the UK, the price range of computer workstation desks are between 110.00 and 128.00 British Pounds depending on its sizes, designs and materials. One can purchase any computer workstation desk at eBay, Walmart, Ikea and many others.
There are plenty kinds of toddler desks which are available for purchase such as Lap Desks for Toddlers, Art Desks for Toddlers, Step2 Deluxe Art Master Desk, Toddler Desks with Storage, Toddler Desk with Easel.
If you are interested in purchasing high quality corner computer desks, there are many brands. To be more specific Cymax is one of the more well known and trust company.
You can purchase cheap computer desks from Office Depot, as well as Staples, and Sam's Club. These retailer's sell products like what you mentioned for under $100. Keep in mind, you get what you pay for, so do some research before making a choice.
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Ventilated laptop computer desks have the added advantage of helping keep your notebook cool. This prevents overheating and can extend the life of your laptop. Thus, in this way, ventilated desks are "better" than the alternative.
I would definitely purchase a computer desk with an easy to assemble hutch, as they are generally cheaply priced. http://www.amazon.com/Computer-Desks-Hutches/b?ie=UTF8&node=1069106
Target, Best Buy, Computer Desk, Office Desk, Walmart, and Amazon all are online retailers with computer desks with a hutch can be found at. They all have variety with desks.